Best 300B tube for Cayin 300B amp?

question for washington high end audio does ur comment on 10/14/11 re sophia electric carbon plate princess 300b for cayin 300b amp ,,also pertain to the 120v version

tried the sophia electric carbon plate ,very good ,then upgraded to the 1200 per pair sophia electric royal princess
wow, what a revelation like the performers are in my listening area cant really think of anything negative of course no overhyped bass slam,but again thats not what music is all about,cayin a300b set. omega super 6 xrs custom built by Louis @ omega speaker systems ,norwalk ct.DNM solid core precision2 speaker cables again this is my findings and opinions.which is not gospel